29 Mar
2020
29 Mar
'20
2:04 p.m.
I have some notes I made about trying a PC PSU, I don't think it really worked, there
are signals to indicate power OK and perhaps others. But perhaps a more concerted effort
might yield something that could work.
Regards
Rob
-----Original Message-----
From: cctech <cctech-bounces at classiccmp.org> On Behalf Of Robert
Armstrong via cctech
Sent: 29 March 2020 19:15
To: 'Maciej W. Rozycki' <macro at linux-mips.org>; 'General Discussion:
On-
Topic Posts' <cctech at classiccmp.org>
Cc: rob at jarratt.me.uk
Subject: RE: H7874 power supply
Maciej W. Rozycki <macro at linux-mips.org>
wrote:
numerous Chemi-Con SXF parts scattered across all boards, some leaking
Yeah, mine is full of "Nippon Chemi-Con" electrolytic too.
What about just gutting the PS chassis and sticking in an ATX power supply? I
don't know how the maximum current per output breaks down, but as I
understand it the H7874 is only a 600W supply. That's not a problem for an
ATX supply, and it would have all the required output voltages. You'd have to
run the cabinet fans at a fixed speed and you'd lose the power control bus
feature, but that's not a show stopper.
Actually my unit is in an R400x chassis full of RF drives, so I believe I only need
+12 and +5. I don't think the 3.3v and -12 are used in that case. I wonder how
much current I really need for the drives? I should look that up and I might be
able to find a surplus dual output supply that would do the job.
Thanks again,
Bob